This stainless steel faucet is a forward sealing faucet similar to a Perlick faucet. It has a modular, threaded spout which can fit a variety of different attachments including a growler filler or a stout spout.
In normal rear-sealing faucets the entire faucet has to drain of beer. In forward-sealing faucets the faucet keeps beer in it so the inside doesn't have a chance to get sticky, making cleaning much easier. It also reduces the chance of off-flavors transferring to your beer while you pour.